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R. WOOTTON 81; B. HEWITT. MEANS FOR RELEASING TUBEg FROM MANDRELS- No.547,234. Patented Oct. 1-, 18195.

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& B. HEWITT. TUBES FROM MANDRELS- R. WOOTTON MEANS FOR RELBASING No.547,234. Patented oat. 1, 1895.

Unites States PATENT @rrroe.

ROBERT WOOTTON AND BENJAMIN HEWITT, OF BIRMINGHAM, ENGLAND.

MEANS FOR RELEASING TUBES FROM MANDRELS.

SPECIFICATION forming part of Letters Patent No. 547,234, dated October1, 1895. App icati filed November 14, 1894:. Serial No. 528,729. (Nomodel.) Patented in England June 21, 1894,1l0. 12,012.

T0 at whom it may concern.-

Be it known that we, ROBERT WooTToN, gentleman, residing at HarborneRoad, Edgbaston, and BENJAMIN HEWITT, engineer,residing at 7 2 WigginStreet, Icknield Port Road, Birmingham, county of Warwick, England,subjects of the Queen of Great Britain, have invented certain new anduseful Improvements in Means for Releasing Tubes from the Mandrel orSolid Bar upon which they are Drawn, of which the following is aspecification.

The invention has been patented in England, No. 12,012, dated June 21,1894.

Our invention has for its object improvements in means for releasingtubes from the mandrel or solid bar upon which they are drawn, by whichwe readily render the removal of such mandrels or bars easy ofaccomplishrnent, and this without in any way marking the tubes in theprocess.

In carrying our invention into effect we run the tubes containing themandrel or solid bar through two horizontal rolls, which are so shapedthat they press upon the tubes upon two sides only in such a manner thatthey roll the tube into a slightly-oval shape, the bulge taking place oneach side of the tube which is not under the pressure of the rolls.These rolls are so geared as to feed the tube into two vertical rolls ofa similar shape to those of the horizontal rolls which have theirpressure upon those two sides of the tubes in which the bulge was madeby the previous rolls, thus pressing it in and causing the reverse twosides which had been previously pressed to slightly bulge out from themandrel or bar, by which means the tube is slightly enlarged without inany way altering its shape or marking it, as the rolls in each case areround, so that they present a perfectly-smooth surface to thetube. Itwill readily be seen that after the tube has been by these meansslightly enlarged the removal of the mandrel or bar will be easy toaccomplish, and in case of tubes other than those that are round insection we vary the shape of the rolls to suit the shape of the tube, soas to press or bite it first on two sides or at two points, andafterward upon the other two sides or two points, as before described.One of the section pair of rolls may be geared to revolve, the other onerevolving by friction, or the second pair of rolls may revolve entirelyby friction.

' In order that our invention may be clearly understood and more easilycarried into practice, we have appended hereunto two sheets of drawings,upon which we have fully illustrated the nature of our saidimprovements.

Figure 1 is a cross-section through our machine. Fig. 2 is a plan ofsame. Fig. 3 is a part end elevation of the rolls B. Fig. 4 is a sectionA. Fig. 5 is a front elevation of the straightening device at theentrance to the rolls B. Fig. 6 is an enlarged section of nip of therolls A A. Fig. 7 is an enlarged section of nip of the rolls B B.

Our machine for the releasing of the tubes from the mandrel or solid barupon which they are drawn consists of the horizontal rolls A A, mountedin suitablehousings X, which also support the brackets Y or othersuitable means for the pair of vertical rolls B B. The rolls A A aregeared by the wheels 0 and are driven by the pulley E through the trainof wheels T, F, and f, while the pinion F drives the vertical roll B bymeans of the intermediate bevel-wheels S and b.

Straightening-rollers D and D are provided at the entrance to the firstpair of rolls A, the tube being guided in between same bya suit abletrumpet-mouth V. The rollers D are mounted upon the sliding block R,upon which the wedge-shaped block 1* is mounted, the lever P beingprovided, so that upon being pressed its roller 19 acts upon the blockand forces it sufficiently far back for the tube to be easily inserted,after which upon the handle being released the block is retained withits pressure tight upon the tube, the pressure being obtained by anysuitable spring, such as J. The lever P is retained out of action by theweight W. The pressure upon the rolls A A is provided by the set-screw aacting upon the intermediate springs H. The lateral adj ustment of therolls A A is effected by the screw pin a while the means for adjustingthe nip of the rolls vertically is provided by means of the wedge-shapedblocks at, Fig. 4. This arthrough the housing of the lower rolls.

rangement allows of the nip of the two pairs of rolls A A and B B beingbrought exactly to a true line.

The pressure upon the vertical roll B is ob tained by the nut n throughthe intermediate springs N.

In releasing the tubes from the mandrel or solid bar upon which they aredrawn we run the said tubes through the horizontal rolls A A, which areprovided with the grooves a which are so shaped that they press upon thetubes K on two sides, as shown at Fig. 6, and thus roll the said tubeinto a slightly-oval shape, the bulge taking place at 70 on each side.These rolls A A feed the tube into the vertical rolls B B, which are ofa similar shape to the horizontal rolls, but have their pressure uponthe reverse sides of the tube, so as to slightly bulge out the sideswhich had been previously pressed, as shown at Fig. 7, the two pair ofrolls being so made adjustable one to another, as before described, thatthe nip or pressure of the second pair of rolls is exactly at rightangles to the nip or pressure of the feeding pair AA. After the tube hasbeen enlarged in this manner it will be seen that the removal of themandrel or bar M is a comparatively easy matter. The roll 13' may begeared instead of running by friction, as shown. The tube as it entersthe rolls A A is drawn through the rollers D D, and is therebystraightened by the process.

The rolls B B may be formed with a groove formed to the segment of atrue circle, so as to bring the tube perfectly round in section.

We claim- 1. In combination the pairs of rollers A, A arranged to presson the top and bottom of the tube leaving the sides free and the secondpair of rollers B, B arranged at right angles to the first set and inrearthereof to receive the tube after leaving the first set, saidrollers being adapted to press on the sides of the tube leaving the topand bottom thereof free, all of said rollers being geared together to0perate in unison and to-feed. the tube between them, substantially asdescribed.

2. The improved, machine for releasing tubes from solid mandrelscomposed of the horizontal rolls A A and vertical rolls B B gearedtogether and set in the frame work and provided with the adjustingspring H regu lated bythe screw A in combination with the spring Nadjustable by the nut N the whole being capable of adjustment in theself-containing frame work as herein set forth and shown. 7

In testimony that we claim the foregoing as our own we affix our namesin the presence of two witnesses.

ROBERT WOOTTON. B. HEWITT.

Withessesi REGINALD LEW MoRGAN, ALBERT NEMEY.

